Finding the Fourth Proportional to 1,776.39, 2,451.42 and 990.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,776.39 : 2,451.42 = 990.42 : x
2. Step 2: Convert to fraction form
   1,776.39/2,451.42 = 990.42/x
3. Step 3: Cross multiply
   1,776.39x = 2,451.42 × 990.42
4. Step 4: Simplify right side
   1,776.39x = 2,427,935.40
5. Step 5: Solve for x
   x = 2,427,935.40/1,776.39
6. Step 6: Final answer
   x = 1,366.78